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Water Resources and Water Accounts in Mauritius Workshop for the implementation of SEEA-Water and IRWS Pretoria, South Africa Presented by: D. Deepchand.

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Presentation on theme: "Water Resources and Water Accounts in Mauritius Workshop for the implementation of SEEA-Water and IRWS Pretoria, South Africa Presented by: D. Deepchand."— Presentation transcript:

1 Water Resources and Water Accounts in Mauritius Workshop for the implementation of SEEA-Water and IRWS Pretoria, South Africa Presented by: D. Deepchand and A.Sookun Mauritius June 2011

2 Contents Physiography General Information Water Resources and Hydrology Water use by sectors Water Accounts 2

3 Physiography 3 Mauritius

4 Volcanic Formation 2 Volcanic activities -10 million years - 25,000 years ago.

5 Mauritius 5

6 General Information The island is of volcanic origin. The volcanic activity of the island ended about 25,000 years ago. Population: 1.27 Million Area of Mauritius: 1865 km 2 Major Climatic Conditions: Sub Tropical Summer & Winter Sources of water supply: Surface water & Groundwater 6

7 Country’s Water Profile The Water Cycle… from clouds to sea.. from sea to clouds…

8 RAINFALL PATTERN 3600 mm 3000 mm 2000 mm 1000 mm Precipitation mm Average Annual Rainfall = 2000 mm Summer = 1340 mm Winter = 660 mm 6

9 9 Area of Mauritius: 1865 km 2 Annual average rainfall: 2000 mm Annual volume of raw water: 3700 Mm 3 Estimated water utilisable potential (33%) : 1250 Mm 3 Water Balance

10 The water cycle overview in Mauritius Adapted from: http://watercycle.gsfc.nasa.gov/ 30%100% 60% 10%

11 INSTITUTIONAL ARRANGEMENT FOR WATER RESOURCES Water Resources Unit Responsible for the assessment, mobilisation, control, development, management and conservation of water resources Central Water Authority Responsible for treatment and supply of water for domestic, commercial and industrial purposes WRU IA CWA WMA CEB Water Resources Unit 1

12  Surface water resources 6 impounding reservoirs total capacity = 77.4 Mm 3 annual yield = 135 Mm 3 6 Potable Water Treatment Plants 3 major river abstractions (for Potable Water Supply )  Groundwater resources 406 wells 12 Water Resources

13 Hydrological data Surface water - 25 major river basins ◦ 107 Flow measuring station ◦ 350 river run off takes Groundwater - 5 main aquifers ◦ 300 Observation Wells ◦ 114 potable (90 % of total G/w production ) ◦ 156 private agricultural (5%) ◦ 136 Industrial (5%) 13

14 14 Water Stress: A supply less than 1700 m 3 /person/yr Water Scarce: A supply less than 1000 m 3 /person/yr (UNDP 1998) Today Mauritius is already water stressed. (actual supply is 1028 m 3 /person/yr ) By 2025 Mauritius will be water scarce. (supply expected to drop to 862 m 3 /person/yr ) Water Stress & Water Scarcity

15 WATER UTILISATION (Million cubic metres per year) Year 2009 Purposes Surface Water GroundwaterTotal River-run Off-takes Storage Municipal (Domestic, Industrial & Tourism) 36 * 76111223 Industrial (Surface- Groudwater) 5-510 Agricultural (including Water Rights) 32074 * 7401 Hydropower199169 * -368 OVERALL UTILISATION5603191211000* TOTAL WATER MOBILISATION 524254121899 * includes 101 Mm 3 used for irrigation/potable purposes after hydropower generation at Réduit. Magenta, Tamarind Falls and power generation at Le Val and La Ferme, twice. 7

16 16 Potable water VolumeM 3 Tariff- US$ Domestic Non domestic 1 st - 100.151 st - 100 commercial 0.42 Tourism 0.60 I ndustry 0.33 Next 50.18Next 1500.530.800.40 Next 50.25All add..0.701.000.53 Next 100.32 Next 200.45 Next 500.60 Next 1000.80 All additional1.00 Waste water Tariff First 100.18All0.67 Next 100.22non Next 300.50Domestic All additional1.13

17 Water Accounts Data Sources: ◦ Census of Economic Activities, CSO ◦ Water Resources Unit ◦ Central Water Authority – Water Supplier ◦ Wastewater Management Authority

18 Potable Water Use by sectors Potable Water Use by sectors Domestic -66% Industrial (manufacturing) - 8% Commercial - 8% Tourism - 5% Vegetables -6% Govt. Buildings -5% Others -2% 18

19 Economic Evolution 19 TimePer capita income Economy% GDP Year1968 (At independence) US$260Sugar-cane monocrop6.8% PresentUS$6700Sugar, manufacturing and tourism 23.6%

20 Economic Accounting For Water Water Asset Account & Physical Supply and Use accounts have been compiled and used to calculate indicators:  Water use intensity  Water productivity 20

21 Water Use Intensity: Water Use Intensity: amount of water required to produce one unit currency 21 SectorWater intensity Average for Economy 40litres/US$ Agriculture820 litres/US$ Industry4.2 litres/US$ Agriculture requires: 20 times more water as compared to the average for whole economy 200 times more water as compared to industry Source: SADC Economic Accounting of Water Use Account

22 Water Productivity Water Productivity: contribution of water to economy 22 SectorWater Productivity Average for Economy 27.41 US$/m 3 Agriculture0.38 US$/m 3 Industry236.74 US$/m 3 Average Economy contributes 70 times more than agriculture Industry contributes 600 times more than agriculture Source: SADC Economic Accounting of Water Use Account

23 Water use and economic contribution Agriculture uses 67.7% of water but contributes to 10% of employment and 6% of GDP 23

24 Water Accounts Source: CSO

25 MAJOR CHALLENGES Climate change leading to: –Reduction in the average rainfall -Reduction of 10% over 30 years –more occurrence of short duration high intensity rainfall-flash floods –Sea level rise impacting on the groundwater quality in the coastal regions Low coverage of sanitation facilities: –Degradation of raw water quality -Public Sewerage Coverage presently 30% to reach 50%by 2015 Industrial development : –Control of Discharge of effluent into open environment- Enforcement of effluent Discharge Regulations Non Revenue Water: –Reduction of NRW to acceptable level- 2000 km of old CI,Ac,Steel pipes to replace-Cost 400 M US$

26 Socio-Economic Development and the Environment –Finite & vulnerable natural resource –Social & economic good Drinking and Sanitation –Access to safe water supply – Practically 100% –Integrated sanitation & water supply services - Practically 100% Agriculture and Food Security –Sustainable irrigated agriculture –Increase in water use efficiency –Re-use of treated effluent Energy Development –Use of hydro-power – 5% of total energy Industrial Development –Water at economic value Environment –Control of quality of effluent discharged into water bodies flow GENERAL & SECTORAL POLICIES

27 Conclusion The challenge for water accounting is to have all the above 27

28 Thank 28 You …


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